Anyway, many people will not be scrolled during PK in official. Duo or trio parties with all scrolled, especially the ones who have a tormenter in their party will get a big advantage against others, so duo or trio parties will always be possible during official.
You shouldn't take open beta as an example, because it was just a gangfest.
One more thing is, DD shields and helmets will be dropped in official. (I may sound lame for bringing this up in every situation, but it is the truth.) Use both of them, you are immortal against assasins because we won't be getting BB for a while, which does around 1000 damage on you in a spike cooldown, while spike does 150-200 max. (May be lower with the daggers we can get. I was hitting around 250 to a warrior with ~60 DD in total, with dual mds +9 and around 2400+ ap.)